Universal Serial Bus Device Class Definition for Printing DevicesThe Universal Serial Bus (USB) is a communications architecture that gives a PC the ability to interconnect avariety of devices via a simple four-wire cable. One such device is the printer. Traditionally, printers have beeninterfaced using the following technologies:• Unidirectional parallel port• Bi-directional parallel port• Serial port• SCSI port• Ethernet/LANThere are other, more sophisticated printer interfaces, but the ones previously listed are the most popular. USBoffers a much greater throughput capability than the serial port and is comparable in speed to the parallel port. Thismakes both parallel and serial printers good candidates for interfacing with USB.1.1 ScopeThis document fully describes the Printer Class of USB devices, including:• The Printer Class subclass and protocol.• Device, configuration, interface, and endpoint des criptors.• The USB standard requests used by printer devices.• The USB class-specific requests and responses used by printer devices.
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